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Zk Light Clients
The Light Client in Flash Trade plays a critical role in ensuring the security and integrity of cross-chain transactions. Its fundamental purpose is to maintain a lightweight, up-to-date representation of the state of various blockchains and verify transactions across them.
The Light Client in Flash Trade is responsible for tracking the latest state of different blockchains. It uses advanced cryptographic techniques, such as zero-knowledge proofs (Zk proofs), to verify token transfers between various chains. If a resolver is unable to send tokens to a user, a Zk proof of the failed trade is constructed. This proof can be used to initiate a refund from the locked collateral, ensuring the security and integrity of every transaction. Zk proofs can also be used by liquidators. If a resolver fails to fill an order, a liquidator does it instead and shows a proof to take the resolver’s collateral.
Zk proofs are also used by liquidators when resolvers fail to complete orders, and the liquidator closes the orders instead. After closing the orders, liquidators show their proofs that allow them to take the resolvers’ collateral.
Protocol Maintainers play a key role in the Flash Trade network. Their responsibility is to keep the Light Clients on each chain up-to-date with the latest block headers. To accomplish this, they periodically query for the latest finalized block header and then generate a Zk proof that attests to the fact that the block is valid. This Zk proof is then passed as an argument into a function within the Light Client contract for verification.
All contracts are open-source and can be used to generate the above proofs when running one's own Zk-Node if desired.
To ensure the integrity of data provided in the light-client update transactions, the Light Client must verify each transaction. In the Flash Trade network, this involves the use of Zk proofs. A zero-knowledge proof is a cryptographic technique that allows one party to prove to another that a statement is true without revealing any information beyond the fact that the statement is indeed true. In this case, the Light Client uses zero-knowledge proofs to verify the validity of token transfers between different chains.
The Light Client plays a critical role in the Flash Trade network, helping to ensure the security and integrity of cross-chain transactions. By utilizing advanced cryptographic techniques (such as Zk proofs), the use of Light Clients allows for rapid and secure token transfers between different blockchains.
It is planned to focus on expanding the list of supported networks, optimizing Zk-calculations, and establishing their optimal distribution among protocol maintainers. In addition to using optimization mechanisms such as Aggregated BLS Signature Verification, it is planned to use distributed computing algorithms such as deVirgo (distributed version of the Virgo proof system). All this will improve the efficiency of using light clients and the reliability of the data provided.